President Donald Trump warned the UK and Canada against striking business deals with China, after British Prime Minister Keir Starmer became the latest US ally to announce plans to deepen trade ties during a visit to Beijing.

U.S. President Donald Trump has warned the United Kingdom against getting into business with China after British Prime Minister Keir Starmer and Chinese leader Xi Jinping hailed a reset in relations.

The biggest commercial announcement came from AstraZeneca, which promised to invest $15bn (£11bn) in China over the next four years, to expand research and the manufacturing of medicines – the company...